West Wales, last weekend. The old foam mattress lying waterlogged on an otherwise clean beach might have been at sea for months before it was washed up on the tide. A large bit of it had broken off, and the rest was crumbling. It was a clear threat to wildlife, so we heaved what was left of it above the wave line and promised to come back to dispose of it properly when it was dry.

But how do you safely dispose of an old mattress made of billions of tiny plastic particles leaking formaldehyde and other potentially dangerous chemicals? Do you burn it? Bury it? Do you expect the company who made it to come to collect it? Answers to environment secretary Michael Gove, who today pledged to stem the tide of plastic debris by announcing a consultation on a plastic-bottle return scheme for England, which aims to get people to recycle more.